package org.balthie.demo.jdk.util.concurrent.auxiliary.countdownlatch;

import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.concurrent.CountDownLatch;

public class CountDownLatchDemo1
{
    final static SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
    
    public static void main(String[] args) throws InterruptedException
    {
        CountDownLatch latch = new CountDownLatch(2);// 两个工人的协作
        Worker worker1 = new Worker("zhang san", 5000, latch);
        Worker worker2 = new Worker("li si", 8000, latch);
        worker1.start();//
        worker2.start();//
        latch.await();// 等待所有工人完成工作
        System.out.println("all work done at " + sdf.format(new Date()));
    }
    
    static class Worker extends Thread
    {
        String workerName;
        
        int workTime;
        
        CountDownLatch latch;
        
        public Worker(String workerName, int workTime, CountDownLatch latch)
        {
            this.workerName = workerName;
            this.workTime = workTime;
            this.latch = latch;
        }
        
        public void run()
        {
            System.out.println("Worker " + workerName + " do work begin at " + sdf.format(new Date()));
            doWork();// 工作了
            System.out.println("Worker " + workerName + " do work complete at " + sdf.format(new Date()));
            latch.countDown();// 工人完成工作，计数器减一
            
        }
        
        private void doWork()
        {
            try
            {
                Thread.sleep(workTime);
            }
            catch (InterruptedException e)
            {
                e.printStackTrace();
            }
        }
    }
    
}